| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 26 |
7.1%
|
| 2 | 1-3 years | 83 |
22.6%
|
| 3 | 3-5 years | 69 |
18.8%
|
| 4 | Longer than 5 years | 176 |
47.8%
|
| 5 | Don?t remember | 14 |
3.8%
|
| Sysmiss | 12112 |